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Starrett indicator hole attachment measure inside holes
Starrett Indicator Hole Attachment
The Starrett Indicator Hole Attachment makes it possible to measure the inside of holes and other surfaces that cannot be reached with the regular indicator spindle. The indicator hole attachments have a .375" (9.5 mm) diameter hole to fit all indicators made to AGD standards and can be securely clamped to the indicator stem. The ball end on the swivel arm which contacts the work is 1/8" (3 mm) in diameter.
I do not know what number this part is.
